What Is CVV? The 3 Digits Standing Between Merchants and $33 Billion in Fraud
Three numbers on the back of your card — here's why banks invented them, how they're mathematically generated, and what they actually confirm (and don't).
Read articlePractical guides on card verification, chargebacks, fraud prevention, and payment security — written by payment engineers, not marketers.
Three numbers on the back of your card — here's why banks invented them, how they're mathematically generated, and what they actually confirm (and don't).
Read articleZero-dollar auth and auth holds let you confirm a card is live before attempting a real charge. Here's how both methods work and when to use each.
Read articleA complete guide to every major decline code — translated from bank-speak into what each one means, which are retryable, and what to do next.
Read articleBIN lookup reveals the issuing bank, card type, level, and country from the first 6-8 digits. Here's what that data means and how merchants use it.
Read article85% of merchants have been targeted. Card testing validates stolen cards at your expense. Here's how to detect it and stop it.
Read article261 million chargebacks in 2025. 79% were friendly fraud. The true cost per chargeback is $4.61. Here's what the data says and what actually works.
Read article